Results 211 to 220 of about 70,297 (251)

The decay of homogeneous isotropic turbulence

Physics of Fluids A: Fluid Dynamics, 1992
A new theory for the decay of homogeneous, isotropic turbulence is proposed in which truly self-preserving solutions to the spectral energy equation are found that are valid at all scales of motion. The approach differs from the classical approach in that the spectrum and the nonlinear spectral transfer terms are not assumed a priori to scale with a ...
openaire   +2 more sources

Settling velocity and concentration distribution of heavy particles in homogeneous isotropic turbulence

Journal of Fluid Mechanics, 1993
The average settling velocity in homogeneous turbulence of a small rigid spherical particle, subject to a Stokes drag force, has been shown to differ from that in still fluid owing to a bias from the particle inertia (Maxey 1987).
Lian-Ping Wang, M. Maxey
semanticscholar   +1 more source

Intermittent vortex structures in homogeneous isotropic turbulence

Nature, 1990
ALTHOUGH well developed turbulence exhibits complex, chaotic spatial and temporal behaviour, there is much experimental evidence to suggest that a remarkable degree of coherence is also present1. It is known2 that correlations in small-scale turbulent motions show significant deviations from the gaussian statistics usually expected for large, randomly ...
Zhen-Su She, Eric Jackson, Steven A. Orszag   +2 more
openaire   +1 more source

Homogeneous, Isotropic Flow in Grid Generated Turbulence

Journal of Fluids Engineering, 1999
Detailed grid generated turbulent analysis has been completed using a three-dimensional hot-wire anemometer and traversing mechanism to identify a homogeneous, isotropic flow region downstream of a square mesh. The three-dimensional fluctuating velocity measurements were recorded along the centerline of a wind tunnel test section and spatially over the
Riccardo Tresso, David R. Munoz
openaire   +1 more source

Lagrangian velocity correlations in homogeneous isotropic turbulence

Physics of Fluids A: Fluid Dynamics, 1993
The Lagrangian velocity autocorrelation and the time correlations for individual wave-number bands are computed by direct numerical simulation (DNS) using the passive vector method (PVM), and the accuracy of the method is studied. It is found that the PVM is accurate when Kmax/kd≥2 where Kmax is the maximum wave number carried in the simulation and kd ...
Gotoh, Toshiyuki, Rogallo, Robert S., Herring, Jackson R., Kraichnan, Robert H.   +3 more
openaire   +1 more source

Inequalities in isotropic homogeneous turbulence theory

Journal of Mathematical Physics, 1981
It is postulated that the energy spectrum function is the Laplace transform of a nonnegative distribution φ. The principal physical parameters in the longitudinal correlation function are then expressed in terms of φ integrals and interrelated by Hölder inequalities, to yield experimentally confirmed results like Lp⩾1.825λ.
openaire   +1 more source

Liquid drop breakup in homogeneous isotropic turbulence

International Journal of Numerical Methods for Heat & Fluid Flow, 2019
Purpose This paper aims to demonstrate the capabilities of a diffuse interface free energy lattice Boltzmann method to perform direct numerical simulations of liquid–liquid dispersions in a well-controlled turbulent environment. The goal of this research study is to develop numerical techniques that can visualize and quantify drop interaction with the
Cheng Zhong, Alexandra Komrakova
openaire   +1 more source

Multiscale similarity of isotropic homogeneous turbulence

1999
A similarity form of energy spectrum involving two lengthscales, the Kolmogorov dissipation lengthscale (η) and the empirical energy-containing lengthscale (£), is proposed for isotropic homogeneous incompressible turbulence. The similarity form is approached by considering the energy spectrum as a summation of a series of ordered functions of variable
openaire   +1 more source

Non-isotropic dissipation in non-homogeneous turbulence

Journal of Fluid Mechanics, 1997
On the basis of the two-point velocity correlation equation a new tensor length-scale equation and in turn a dissipation rate tensor equation and the pressure–strain correlation are derived by means of asymptotic analysis and frame-invariance considerations.
openaire   +1 more source

Particle-Turbulence Interaction In Homogeneous Isotropic Turbulence

AIAA Aviation 2019 Forum, 2019
Mohamad I. Cheikh, James M. Chen
openaire   +1 more source